Peter Jackson has some sad news for fans who were hoping to get a sneak peek of the upcoming The Hobbit: The Desolation of Smaug at San Diego Comic-Con. They’ve simply got too much filming happening to spare time for the convention so they can’t attend this year.

Despite the bad news, there is still something good to report. They’ve released a production diary from the set and it’s fantastic. It’s got lots of behind-the-scenes footage, including dwarves doing aerobics. It’s all the rage in Middle-earth this summer.